cyb3rko / kden-handbook

My personal notes and scripts for my KDE neon setup

KDE Neon Handbook

System info: (KDE Neon + Plasma Wayland)

---

• Resource Management
  • Large file and folder monitor
  • Find large files
  • AutoTrash
  • journalctl
• Packages
  • Flatpak dark mode applications
  • Packages Cleanup
  • Replace legacy keyrings
  • Remove Plasma Welcome
  • Remove Bluetooth
  • Remove KWallet
  • Remove KDE Connect
  • Remove all pip packages
• Nvidia Graphics
• SSL Inspection
  • Add root CA to java
• Applications
  • Firefox
  • OneDrive
  • Timeshift
  • Wireshark
• Other Tools
  • JAVA_HOME
  • Exiftool

---

Resource Management

Large file and folder monitor

Use the CLI tool ncdu for a simple overview of the largest files and folders.

ncdu

Find large files

Find files in current directory with a specified minimum size (in this example 100 MB)

find . -type f -size +100M

Autotrash

To automatically clear older files in the trash, run the following (example: files older than 40 days):

sudo apt-get install pipx
pipx install autotrash

autotrash -d 40 --install

journalctl

See space used by system logs:

journalctl --disk-usage

Set maximum log retention time in /etc/systemd/journald.conf

MaxRetentionSec=2months

Packages

Flatpak dark mode applications

To enable the Breeze Dark theme for Flatpak applications, change the setting in the following files:

~/.config/gtk-3.0/settings.ini + ~/.config/gtk-4.0/settings.ini

...
gtk-theme-name=Breeze-Dark
...

Packages Cleanup

To automatically remove unused packages and applications:

sudo apt-get autoremove && sudo apt-get autoclean && flatpak uninstall --unused

Replace Legacy Keyrings

for KEY in $( \
    apt-key --keyring /etc/apt/trusted.gpg list \
    | grep -E "(([ ]{1,2}(([0-9A-F]{4}))){10})" \
    | tr -d " " \
    | grep -E "([0-9A-F]){8}\b" \
); do
    K=${KEY:(-8)}
    apt-key export $K \
    | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/imported-from-trusted-gpg-$K.gpg
done

Source: https://askubuntu.com/a/1415702

Remove Plasma Welcome

sudo apt-get purge --autoremove plasma-welcome

Remove Bluetooth

sudo apt-get purge --autoremove bluez

Remove KWallet

sudo apt-get purge --autoremove kwalletmanager

Remove KDE Connect

sudo apt-get purge --autoremove kdeconnect

Remove all pip packages

pip freeze > requirements.txt

pip uninstall -r requirements.txt

Nvidia Graphics

To enable support for Nvidia Graphics Cards using Wayland do the following:

Install the Nvidia Wayland library:

sudo apt-get install libnvidia-egl-wayland1

Afterwards list available Nvidia graphics drivers for Ubuntu derivates and install the recommended one:

sudo ubuntu-drivers list
sudo ubuntu-drivers install

SSL Inspection

Add root CA to java

Navigate to */jbr or */jre and then lib/security.
Then type the following:

keytool -import -alias aldi -keystore cacerts -file ~/Dokumente/AlDiRootCA.crt

Applications

Firefox

flatpak install flathub org.mozilla.firefox

To apply policies to Firefox via the policies.json, just place it at /var/lib/flatpak/app/org.mozilla.firefox/x86_64/stable/<id>/files/lib/firefox/distribution.
Restart Firefox and find applied policies at about:policies.

Custom configs not available with the centralized policy configuration:

• full-screen-api.warning.timeout: 0 (disables the fullscreen popup)
• reader.parse-on-load.enabled: false (disables the simplified reader mode)
• remove all removable search keywords in the search settings

OneDrive

To install the current version (and not download from Ubuntu Universe) use the following installation instructions:
https://github.com/abraunegg/onedrive/blob/master/docs/ubuntu-package-install.md#distribution-ubuntu-2204

To allow logging to /var/log/onedrive, do the following:

sudo mkdir /var/log/onedrive
sudo chown root:niko /var/log/onedrive
sudo chmod 0775 /var/log/onedrive

Initialize onedrive:
onedrive

After initializing onedrive and BEFORE running the first sync, copy config and sync_list to ~/.config/onedrive/. Check the config with onedrive --display-config.

First sync:
onedrive --resync --synchronize

Timeshift

To fix a buggy and old version in the default repo, load a newer version from a non-default repo:

sudo add-apt-repository ppa:teejee2008/timeshift
sudo apt-get install timeshift=24.01.1-0
sudo apt-mark hold timeshift

Copy timeshift.json to /etc/timeshift/ to apply custom backup settings.
Adjust the backup drive if needed.

Wireshark

To install Wireshark and allow traffic capture on all interfaces, do the following:

sudo apt-get install wireshark
sudo chmod +x /usr/bin/dumpcap
sudo adduser $USER wireshark

Other Tools

JAVA_HOME

To set the JAVA_HOME variable, edit the .profile file in your home dir and add the following:

export JAVA_HOME="the path to the parent of your java bin path"
export PATH=$JAVA_HOME/bin:$PATH

Exiftool

sudo apt-get install libimage-exiftool-perl

exiftool -all= file.png